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/**
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see .
 */
package org.evosuite.ga.comparators;

import java.io.Serializable;
import java.util.Comparator;

import org.evosuite.ga.Chromosome;

/**
 * This class implements a Comparator (a method for comparing Chromosomes
 * objects) based on the crowd distance of two chromosome objects.
 * 
 * @author Annibale Panichella, Fitsum M. Kifetew
 */
public class OnlyCrowdingComparator implements Comparator, Serializable {
	
	private static final long serialVersionUID = -6576898111709166470L;

	/**
	 * Compare the crowd distance value of two chromosome objects.
	 * 
	 * @param c1 a {@link org.evosuite.ga.Chromosome} object
	 * @param c2 a {@link org.evosuite.ga.Chromosome} object
	 * @return -1 if crowd distance value of c1 is higher than the crowd distance of c2, 0 if the crowd
     *         distance of both objects is equal, or 1 if crowd distance value of c1 is lower than the
     *         crowd distance of c2.
	 */
	@Override
	public int compare(Chromosome c1, Chromosome c2) {
		if (c1.getDistance() > c2.getDistance()) {
			return -1;
		} else if (c1.getDistance() < c2.getDistance()) {
			return +1;
		} else { 
			return 0;
		}
	}
}